1/* 2 * arch/sh/mm/numa.c - Multiple node support for SH machines 3 * 4 * Copyright (C) 2007 Paul Mundt 5 * 6 * This file is subject to the terms and conditions of the GNU General Public 7 * License. See the file "COPYING" in the main directory of this archive 8 * for more details. 9 */ 10#include <linux/module.h> 11#include <linux/bootmem.h> 12#include <linux/memblock.h> 13#include <linux/mm.h> 14#include <linux/numa.h> 15#include <linux/pfn.h> 16#include <asm/sections.h> 17 18struct pglist_data *node_data[MAX_NUMNODES] __read_mostly; 19EXPORT_SYMBOL_GPL(node_data); 20 21/* 22 * On SH machines the conventional approach is to stash system RAM 23 * in node 0, and other memory blocks in to node 1 and up, ordered by 24 * latency. Each node's pgdat is node-local at the beginning of the node, 25 * immediately followed by the node mem map. 26 */ 27void __init setup_bootmem_node(int nid, unsigned long start, unsigned long end) 28{ 29 unsigned long bootmap_pages; 30 unsigned long start_pfn, end_pfn; 31 unsigned long bootmem_paddr; 32 33 /* Don't allow bogus node assignment */ 34 BUG_ON(nid > MAX_NUMNODES || nid <= 0); 35 36 start_pfn = start >> PAGE_SHIFT; 37 end_pfn = end >> PAGE_SHIFT; 38 39 pmb_bolt_mapping((unsigned long)__va(start), start, end - start, 40 PAGE_KERNEL); 41 42 memblock_add(start, end - start); 43 44 __add_active_range(nid, start_pfn, end_pfn); 45 46 /* Node-local pgdat */ 47 NODE_DATA(nid) = __va(memblock_alloc_base(sizeof(struct pglist_data), 48 SMP_CACHE_BYTES, end)); 49 memset(NODE_DATA(nid), 0, sizeof(struct pglist_data)); 50 51 NODE_DATA(nid)->bdata = &bootmem_node_data[nid]; 52 NODE_DATA(nid)->node_start_pfn = start_pfn; 53 NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn; 54 55 /* Node-local bootmap */ 56 bootmap_pages = bootmem_bootmap_pages(end_pfn - start_pfn); 57 bootmem_paddr = memblock_alloc_base(bootmap_pages << PAGE_SHIFT, 58 PAGE_SIZE, end); 59 init_bootmem_node(NODE_DATA(nid), bootmem_paddr >> PAGE_SHIFT, 60 start_pfn, end_pfn); 61 62 free_bootmem_with_active_regions(nid, end_pfn); 63 64 /* Reserve the pgdat and bootmap space with the bootmem allocator */ 65 reserve_bootmem_node(NODE_DATA(nid), start_pfn << PAGE_SHIFT, 66 sizeof(struct pglist_data), BOOTMEM_DEFAULT); 67 reserve_bootmem_node(NODE_DATA(nid), bootmem_paddr, 68 bootmap_pages << PAGE_SHIFT, BOOTMEM_DEFAULT); 69 70 /* It's up */ 71 node_set_online(nid); 72 73 /* Kick sparsemem */ 74 sparse_memory_present_with_active_regions(nid); 75} 76